Many proposals to add something to stdlib are rejected here with the suggestion to add such library to pypi first. As noted by someone, pypi is not as reachable as stdlib, and one should install that package first, which many people don't know how. Additionally, there is no natural distinction between 3rd party dependencies and in-project imports (at least in tiny projects).

This can be made easier if the first line of the program will declare the required library, and executing it will try to download and install that library if it is not installed yet.